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Dulwich College have produced a fair few Rugby internationals. I think they had three England players in one squad at one point.
I used to work for Old Alleynians, as a coach. Not for Rugby though.
Alleyns School has impressive facilities too, although not quite on the same scale.
Stonehedge-
Aye, Nick Easter, Andrew Sheridan and David Flatman were regularly down giving coaching sessions or speaking at the excruciating annual dinners.
We would also have semi-regular matches against the leaving 1st XV team at our club. Every year they'd trash our clubhouse, because they could. I'm sure there are some well rounded alumni, but there is a lot of toxic masculinity and entitlement coming out of that place. They are actively taught they are better than everyone else, and it shows.
stevo_com
I used to play rugby for Old Alleynians, the club that used to only exist for ex-Dulwich College pupils. They "opened their doors" in the 80's I think, hence me being able to play there. But still, there is a deep link to the school (grounds rented from them, a ton of actual old boys still registered etc.). We used to use the school's facilities if our club was rained out or if there were too many home games on. Seeing what they had at the school just for rugby, was nuts. I never even got to count all the pitches, or how many different changing rooms or changing room buildings there were. They also have a big sports centre which is like an expensive leisure centre. Kids come out of there at 18 like professional athletes (along with all their other problematic personality traits).